Thanks everyone for the responses. I have watched the APL video recently but have not tried to convert Aaron's code to J. However, the essay suggested by Julian does what I want. Bo's response is intriguing but I have not figured out how to convert my tree representation to ordinal numbers.
On Mon, Jul 20, 2020 at 1:40 PM 'Bo Jacoby' via Programming < [email protected]> wrote: > Minor simplification: > > n=.(/:{])12 3$'000100200110120210220230211221222223' > > (6-~+/"1 n='0')|."0 1 n,"1'00',(4#' '),'§' > > > > Thanks. > Bo. > Den søndag den 19. juli 2020 23.49.17 CEST skrev 'Bo Jacoby' via > Programming <[email protected]>: > > I use ordinal fractions. > > > > nms=.'000';'100';'200';'110';'120';'210';'220';'230';'211';'221';'222';'223' > > > > The digits are ordinal numbers, 1, 2, 3, . . . rather than cardinal > numbers 0, 1, 2, . . . > The digit zero means everything rather than nothing. > > > nms=.'000','100','200','110','120','210','220','230','211','221','222',:'223' > > nms=.(/:nms){nms NB. sort > > (3-~+/"1 nms='0')|."0 1 nms,"1' ' > > 000 > > 100 > > 110 > > 120 > > 200 > > 210 > > 211 > > 220 > > 221 > > 222 > > 223 > > 230 > > > > > This is not the J concept of array, but something else. > > Den søndag den 19. juli 2020 22.13.08 CEST skrev Devon McCormick < > [email protected]>: > > Does anyone have a good way to display a tree in J? EG > C: > |__n0 > | |_n00 > | |_n01 > | > |__n1 > |__n10 > | |__n100 > |__n11 > | |__n110 > | |__n111 > | |__n112 > |__n12 > for a tree in parent index form: > tr=. _1 0 0 1 1 2 2 2 5 6 6 > 6 > nms=. > 'C:';'n0';'n1';'n00';'n01';'n10';'n11';'n12';'n100';'n110';'n111';'n112' > Where "tr" is the parent-index form (with _1 for the root) and "nms" are > the names of each node. > > Any other neat representation of a tree would also be appreciated. > > Thanks, > > Devon > > -- > > Devon McCormick, CFA > > Quantitative Consultant > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Devon McCormick, CFA Quantitative Consultant ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
